/Engine/Source/Runtime/Core/Public/HAL/FileManager.h
Opens a file for writing and create anFArchivewhich can be used to write to it.
Returns a pointer to anFArchivewhen successful and a nullptr if the operation failed. Note that it is up to the caller to delete theFArchivewhen done.
[FArchive](API\Runtime\Core\Serialization\FArchive) * CreateFileWriter ( const TCHAR * Filename, uint32 WriteFlags )